Well, Obito didn't love Kakashi like this - no where near this, in fact. No matter what Sasuke has done, Naruto has remained unflinching. Remember when Sasuke used Enton on his FRS, he was thinking about Raiton and Futon, and stating that "I am glad I am compatible with Sasuke", given that flames take over Futon, when in the past, his Raiton couldn't have done so.
Then when everyone of thinking of different things about their past, Sasuke's childhood and him moving away from himself was on Naruto's mind. I fail to see how Naruto mortally hurting Sasuke is even a slight possibility here. He might get angry, but kill Sasuke? No way.